package fair.utils;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.poi.POIXMLDocument;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hwpf.extractor.WordExtractor;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.multipart.MultipartFile;

public class PoiUtils {
    private final static String xls = "xls";
    private final static String xlsx = "xlsx";
    private final static String DATE_FORMAT = "yyyy/MM/dd";


    public static String readWordString(MultipartFile file) throws IOException {
        String textFileName=file.getOriginalFilename();
        String str = "";
        StringBuilder word = new StringBuilder(str);
        try {
            if(textFileName.endsWith(".doc")){ //判断文件格式
                InputStream fis = file.getInputStream();
                WordExtractor wordExtractor = new WordExtractor(fis);//使用HWPF组件中WordExtractor类从Word文档中提取文本或段落
                int i=1;
                for(String words : wordExtractor.getParagraphText()){//获取段落内容
                    word.append(words);
                    i++;
                }
                fis.close();
            }
            if(textFileName.endsWith(".docx")){
                File uFile = new File("tempFile.docx");//创建一个临时文件
                if(!uFile.exists()){
                    uFile.createNewFile();
                }
                FileCopyUtils.copy(file.getBytes(), uFile);//复制文件内容
                OPCPackage opcPackage = POIXMLDocument.openPackage("tempFile.docx");//包含所有POI OOXML文档类的通用功能，打开一个文件包。
                XWPFDocument document = new XWPFDocument(opcPackage);//使用XWPF组件XWPFDocument类获取文档内容
                List<XWPFParagraph> paras = document.getParagraphs();
                for(XWPFParagraph paragraph : paras){
                    String text = paragraph.getText().trim();
                    word.append(text);
                }
                uFile.delete();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (word.equals(null))
            return null;
        return word.toString();
    }
    /**
     * 读取word文件
     * @param file
     * @return
     * @throws IOException
     */
    public static Map<String, Object> readWordMap(MultipartFile file) throws IOException{
        String textFileName=file.getOriginalFilename();
        Map<String, Object> wordMap = new HashMap<>();//创建一个map对象存放word中的内容
        try {
            if(textFileName.endsWith(".doc")){ //判断文件格式
                InputStream fis = file.getInputStream();
                WordExtractor wordExtractor = new WordExtractor(fis);//使用HWPF组件中WordExtractor类从Word文档中提取文本或段落
                int i=1;
                for(String words : wordExtractor.getParagraphText()){//获取段落内容
                    System.out.println(words);
                    wordMap.put("DOC文档，第（"+i+"）段内容",words);
                    i++;
                }
                fis.close();
            }
            if(textFileName.endsWith(".docx")){
                File uFile = new File("tempFile.docx");//创建一个临时文件
                if(!uFile.exists()){
                    uFile.createNewFile();
                }
                FileCopyUtils.copy(file.getBytes(), uFile);//复制文件内容
                OPCPackage opcPackage = POIXMLDocument.openPackage("tempFile.docx");//包含所有POI OOXML文档类的通用功能，打开一个文件包。
                XWPFDocument document = new XWPFDocument(opcPackage);//使用XWPF组件XWPFDocument类获取文档内容
                List<XWPFParagraph> paras = document.getParagraphs();
                int i=1;
                for(XWPFParagraph paragraph : paras){
                    String words = paragraph.getText();
                    System.out.println(words);
                    wordMap.put("DOCX文档，第（"+i+"）段内容",words);
                    i++;
                }
                uFile.delete();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return wordMap;
    }
    /**
     * 读入excel文件，解析后返回
     * @param file
     * @throws IOException
     */
    public static List<String[]> readExcel(MultipartFile file) throws IOException {
        //检查文件
        checkFile(file);
        //获得Workbook工作薄对象
        Workbook workbook = getWorkBook(file);
        //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回
        List<String[]> list = new ArrayList<String[]>();
        if(workbook != null){
            for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
                //获得当前sheet工作表
                Sheet sheet = workbook.getSheetAt(sheetNum);
                if(sheet == null){
                    continue;
                }
                //获得当前sheet的开始行
                int firstRowNum  = sheet.getFirstRowNum();
                //获得当前sheet的结束行
                int lastRowNum = sheet.getLastRowNum();
                //循环除了第一行的所有行
                for(int rowNum = firstRowNum+1; rowNum <= lastRowNum; rowNum++){
                    //获得当前行
                    Row row = sheet.getRow(rowNum);
                    if(row == null){
                        continue;
                    }
                    //获得当前行的开始列
                    int firstCellNum = row.getFirstCellNum();
                    //获得当前行的列数
                    int lastCellNum = row.getPhysicalNumberOfCells();
                    String[] cells = new String[row.getPhysicalNumberOfCells()];
                    //循环当前行
                    for(int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++){
                        Cell cell = row.getCell(cellNum);
                        cells[cellNum] = getCellValue(cell);
                    }
                    list.add(cells);
                }
            }
            workbook.close();
        }
        return list;
    }

    //校验文件是否合法
    public static void checkFile(MultipartFile file) throws IOException{
        //判断文件是否存在
        if(null == file){
            throw new FileNotFoundException("文件不存在！");
        }
        //获得文件名
        String fileName = file.getOriginalFilename();
        //判断文件是否是excel文件
        if(!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){
            throw new IOException(fileName + "不是excel文件");
        }
    }
    public static Workbook getWorkBook(MultipartFile file) {
        //获得文件名
        String fileName = file.getOriginalFilename();
        //创建Workbook工作薄对象，表示整个excel
        Workbook workbook = null;
        try {
            //获取excel文件的io流
            InputStream is = file.getInputStream();
            //根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象
            if(fileName.endsWith(xls)){
                //2003
                workbook = new HSSFWorkbook(is);
            }else if(fileName.endsWith(xlsx)){
                //2007
                workbook = new XSSFWorkbook(is);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return workbook;
    }

    public static String getCellValue(Cell cell){
        String cellValue = "";
        if(cell == null){
            return cellValue;
        }
        //如果当前单元格内容为日期类型，需要特殊处理
        String dataFormatString = cell.getCellStyle().getDataFormatString();
        if(dataFormatString.equals("m/d/yy")){
            cellValue = new SimpleDateFormat(DATE_FORMAT).format(cell.getDateCellValue());
            return cellValue;
        }
        //把数字当成String来读，避免出现1读成1.0的情况
        if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
            cell.setCellType(Cell.CELL_TYPE_STRING);
        }
        //判断数据的类型
        switch (cell.getCellType()){
            case Cell.CELL_TYPE_NUMERIC: //数字
                cellValue = String.valueOf(cell.getNumericCellValue());
                break;
            case Cell.CELL_TYPE_STRING: //字符串
                cellValue = String.valueOf(cell.getStringCellValue());
                break;
            case Cell.CELL_TYPE_BOOLEAN: //Boolean
                cellValue = String.valueOf(cell.getBooleanCellValue());
                break;
            case Cell.CELL_TYPE_FORMULA: //公式
                cellValue = String.valueOf(cell.getCellFormula());
                break;
            case Cell.CELL_TYPE_BLANK: //空值
                cellValue = "";
                break;
            case Cell.CELL_TYPE_ERROR: //故障
                cellValue = "非法字符";
                break;
            default:
                cellValue = "未知类型";
                break;
        }
        return cellValue;
    }
}
